The capacity (size) of the hard disk determines how much data the disc can accommodate.

Width

101.6 mm (10.16 cm)

110.7 mm (11.07 cm)

Height

20 mm (2 cm)

26.4 mm (2.64 cm)

Depth

146.1 mm (14.61 cm)

182 mm (18.2 cm)

Internal interface

SATA III (88)

Determines the way in which the hard drive is connected to the computer, namely the type of connector through which the drive connects to the device. Each type of connection is unique, and in most cases these connections are not interchangeable.

Read Speed

145 MB/s

261 MB/s

Memory cache

32 MB

512 MB

Write speed

126 MB/s

261 MB/s

HDD rotational speed

5,400 RPM (27)

5,900 RPM (8)

7,200 RPM (53)

Different hard drives spin at different rates. Simply put, the faster the drive can spin, the faster the reading mechanism manages to read (store) information.